双相离子导电膜:气体渗透通量的压力依赖性

IF 4.9 Q1 ENGINEERING, CHEMICAL
Jerry Y.S. Lin, Oscar Ovalle-Encinia
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引用次数: 0

摘要

双相离子导电膜的气体渗透通量的压力依赖性对于使用这些膜的分离或反应过程的设计和操作至关重要。然而,关于双相膜的文献主要关注气体渗透通量的温度依赖性,而不是压力依赖性。本文提出了一种发展双相膜气体渗透通量压力依赖性的理论方法,并以掺钐二氧化铈(SDC)/熔融碳酸盐(MC)双相膜的CO2渗透为例进行了验证。本文提出了一个模型,表明气体通过双相离子导电膜的渗透不仅受各相材料的固有离子(或电子)电导率的控制,还受定义为各相体积与曲折度之比的几何因子的控制。两个相的这些几何因子由每个相的拓扑结构决定。根据合成方法和条件所规定的拓扑结构,相同材料的双相膜可能具有非常不同的压力相关通量方程。CO2通过由低孔隙率SDC制成的SDC-MC膜的渗透由熔融碳酸盐相中的碳酸盐传导控制,从而产生对数CO2压力相关通量方程。具有中等孔隙率的SDC通过SDC-MC膜的CO2渗透受SDC相中氧离子传导的控制,并且CO2渗透通量显示出对CO2压力的幂律依赖性。通过将建模结果与SDC-MC膜的实验CO2渗透数据进行比较,证实了该模型的有效性。这项工作为开发各种双相离子导电膜的压力相关气体渗透通量方程提供了方向。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Dual-phase ionic-conducting membranes: Pressure dependence of gas permeation flux

Dual-phase ionic-conducting membranes: Pressure dependence of gas permeation flux

Pressure dependence of gas permeation flux for dual-phase ionic-conducting membranes is critical to the design and operation of separation or reaction processes using these membranes. However, literature on dual-phase membranes has mainly focused on temperature, rather than pressure dependence of gas permeation flux. This paper presents a theoretical approach for the development of the pressure dependence of gas permeation flux for dual-phase membranes, demonstrated with CO2 permeation for samarium-doped-ceria (SDC)/molten-carbonate (MC) dual-phase membranes. The paper presents a model showing that gas permeation through dual-phase ionic-conducting membranes is controlled not only by the intrinsic ion (or electronic) conductivity of the materials for each phase, but also by the geometric factor defined as the ratio of the volume to tortuosity of each phase. These geometric factors for both phases are determined by the topological structure of each phase. Dual-phase membranes of the same materials can have very different pressure-dependent flux equations depending on the topological structure dictated by synthesis method and conditions. CO2 permeation through SDC-MC membranes made of SDC with low porosity is controlled by carbonate conduction in the molten carbonate phase, leading to logarithmic CO2 pressure-dependent flux equation. CO2 permeation through SDC-MC membrane of SDC with intermediate porosity is controlled by oxygen ionic conduction in the SDC phase, and the CO2 permeation flux shows power-law dependence on CO2 pressures. The validity of the model is confirmed by comparison of the modeling results with experimental CO2 permeation data for SDC-MC membranes. This work provides a direction for developing pressure-dependent gas permeation flux equations for various dual-phase ionic-conducting membranes.

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